1 of 15

DBpedia Japanese

Hideaki Takeda

Professor, National Institute of Informatics (NII)

President, Linked Open Data Initiative, Inc. (LODI)

takeda@nii.ac.jp

​

Hiroki Uematsu

National Institute of Informatics

hiroki_u@nii.ac.jp

​

September 20, DBpedia Day@Semantics'23

2 of 15

The Facts about DBpedia Japanese

  • Maintained by Linked Open Data Initiative, Inc (LODI) and National Institute of Informatics (NII)

​

  • LODI: Promote DBpedia-J to the local community and represent DBpedia-J to International community. LODI is a member of DBpedia Association.

​

​

  • NII: Offer the facilities. Regarded as a task within the research projects

​

​

3 of 15

The Facts about DBpedia Japanese

  • The first version started on April, 2012
    • Use DBpedia Extraction Framework locally
    • Ontology mapping for Japanese

​

  • A new style started on May 18, 2021
    • Use databus and Docker

4 of 15

System Configuration

Front Server

RDFstore

RDFstore

RDFstore

Reverse Proxy

Reverse Proxy

Reverse Proxy

HTML, SPARQL

5 of 15

Statistics

  • Graph http://ja.dbpedia.org/
    • All triples are 5,857,199,436
      • SELECT ?g count(?g) WHERE {GRAPH ?g {?s ?p ?o}} GROUP BY ?g
  • Access Count
    • Monthly Average about 45,000,000 PV.
      • Daily Average about 1,500,000 PV.
      • SPARQL access is about 30%.
    • 10% of the access's User Agent is crawler, but more access may be

​

5

6 of 15

Use of DBpedia Japanese

  • Knowing use of DBpedia is not easy
  • Some scenarios
    • Use in official services
    • Use in applications

7 of 15

Official Service: Japan Search

8 of 15

9 of 15

Official Service: CiNii Research

10 of 15

User-Generated Application/Data

"Linking everything"

11 of 15

User-Generated Application/Data

Search relationship between animals and culture

12 of 15

User-Generated Application/Data

Seiyu (voice actor) LOD

13 of 15

https://2023.lodc.jp/

14 of 15

15 of 15

Summary

  • DBpedia Japanese has bee served for more than 10 years
  • Some official services use DBpedia Japanese
  • Dbpedia Japanese is a good dataset for user generated applications/data